August 2, 2017
Bertha armyworm adult moth counts were generally low across the Prairies in 2017. A few trap sites did enter the moderate risk level, but none was high. See provincial counts in the Prairie Pest Monitoring Network blog. However, as experienced with diamondback moth trap counts this year, egg survival could be higher in dry conditions and warm weather will promote…
August 10, 2016
While economic levels of damage have not been reported anywhere yet this year, individual fields could experience isolated high numbers…
July 27, 2016
Pod-eating insects — including bertha armyworm, lygus and diamondback moth larvae — are at low levels in general in 2016. The biggest factors regulating insect populations are (1) weather, (2) natural enemies and (3) competing food sources. Each is working in favour of lower insect pest pressure this year…
July 13, 2016
Berth armyworm moth counts are generally low (fewer than 300 per trap) across the Prairies, which means a reduced risk for worm damage over the coming weeks…
July 6, 2016
Before spraying, make sure your canola is at the right stage to be damaged by the worms and that the worms are actually the species you’re trying to control. Here’s how to tell the difference…
July 29, 2015
Diamondback moth larvae and grasshoppers have been reported, but so far nothing of widespread significance. The photo shows what grasshoppers can do to a canola plant, but their damage is usually isolated to small patches. Bertha armyworm adult traps are coming down with very little in the way of hotspots…
August 7, 2014
Lygus hotspots: Lygus numbers are high in some regions, with reports of 70+ per 10 sweeps in some fields in central and northern Alberta. Some fields will warrant a spray, but seeing the plane next door does not mean all canola in the area should get sprayed. Assess each field. Bertha armyworm hotspots: Berthas are a very low numbers in…
July 30, 2014
Bertha armyworm is one pest that can do a lot of damage in a short time. They’re large and eat a lot. Even within an area showing low risk on provincial maps, hot spots can flare up. (Photo credit: Roy Ellis)…
February 4, 2014
Canola Watch Live! had two key agronomy messages with regard to bertha armyworm management in 2014: 1. Lower canola prices will mean higher thresholds for bertha armyworm. Click "read more" to see the table. 2. Bertha armyworm populations tend to build for three years, then drop due to disease or beneficial insects. Areas that have had three years of building…
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